Excluding EntraID users and groups from deletion

[julialawrence]

Story Link: ministryofjustice/analytical-platform#4838
Currently the scim function fully reconciles Github membership to AWS Identity Center. However, if we want to progress to a transitional stage where authentication is possible both from Github and EntraID, the Github SCIM function needs to ignore groups and users synchronised from EntraID.

This PR adds logic to skip deletion of users with @justice.gov.uk addresses and groups prefixed with entraid-aws-identitycenter- which will be managed by an alternative Lambda function being developed here: https://github.com/ministryofjustice/moj-terraform-scim-entra-id

Test run with
GITHUB_ORGANISATION=ministryofjustice GITHUB_TOKEN=XXXXXXXXX SSO_AWS_REGION=eu-west-2 SSO_EMAIL_SUFFIX='@digital.justice.gov.uk' SSO_IDENTITY_STORE_ID=XXXXX node index.js
Output snippet:

Skipping deletion of user with email: [email protected]
Skipping deletion of user with email: [email protected]
Skipping deletion of user with email: [email protected]
DRYRUN: [delete] [users] [REDACTED]
Skipping deletion of user with email: [email protected]

[ewastempel]

LGTM